c$.$ Assume $\backslash$alpha $=0\mathrm{.}2,1$ BTC $=$ $$40000,$ each block contains a $6\mathrm{.}25$ BTC fixed reward, and non$-$censoring miners are rational $($profit$-$maximizing$).$ What is the minimum transaction fee required to ensure a transaction spending coins from the blacklist is eventually included in the blockchain?